There are 3 ways you could go about this tutorial. The first will be to acquire a SIP client for your smartphone. The second is to acquire a SIP telephone. The third will be to acquire an ATA (Analog Telephone Adapter), and use a POTS phone to connect to the ATA. There is no way I could go into every possible device, but the Callcentric help center might provide for some help, or at least help you to know what to look for. No matter which option you choose, you will need the following:
- UID (starts with 1777)
- SIP Password (Not your account password)
- SIP Domain (callcentric.com)
If you decide on a SIP client, then I would recommend Acrobits Softphone. This application is $10USD, but in my opinion it is worth it. If the application is too expensive for your budget, then I would recommend 3CX, but I never used that application. I had heard good things about them though. It will definitely be something to consider. It is your responsibility to provide due diligence in making sure you are downloading and installing a suitable client.
You can acquire a SIP telephone. This could be a desk phone which will use an RJ45 connection to connect to your network, and therefore the internet. Many SIP desk phones assumes you are using POE (Power Over Ethernet), and if your hardware doesn’t support that, you will likely need to buy a power cable from the manufacturer. You could also get a DECT or Wifi Phone. The base station for the DECT phone will plug into the home’s network, and into the electrical outlet. However, finding a SIP DECT phone is hard to do. I think Grandstream offers such phones, but this might not be the case when you read this page. There is also Wifi phones. These phones usually have a charging cradle that plugs into the wall, and you would need to use the numeric keypad to log into your Wifi Network. Once you done that, you would be able to configure the remaining parts of the phone through their web GUI interface. I would recommend the Grandsteam WP8xx series of phones. I personally have the WP825 which has done good for me since I owned it.
Last is an ATA. With an ATA, you would be able to plug in any touchtone POTS phone. If you have a rotary and insistent on using an ATA, you would need to buy a phone with push buttons. ATAs as a whole do not support rotary dial phones. You would plug the phone into the ATA, and then you would plug the ATA into your home network. Grandstream, and Linksys both offers ATAs that you could buy from many online stores that would sell such equipment. I would give Amazon a try.